Propper Error: "CMaterialSystem::ReloadMaterials bDeviceReady false"

Phil25

L1: Registered
Jun 13, 2015
49
10
Hello there.

I'm having an odd error with Propper just before the compilation is about start, displaying the above message.

I'm using the newest version of Propper, compiled against the 2013 SDK, and have been using it for a while now. I'm fairly certain all the configurations are correct, since everything was working without a problem ~3 weeks ago, the last time I used it.

All the models I ever compiled are in a seperate .vmf file containing the propper_model only, including the one I'm currently having problems with. All the vmf files yield this error, despite causing no troubles in the past compilations.

Has anyone encountered this error or has a potential solution?
Many thanks.

Full compile log:
Code:
** Executing...
** Command: propper
** Parameters: -game "S:\Steam\steamapps\common\Team Fortress 2\tf" "w:\valve hammer editor\10x_redone_stages\powerhouse"

Propper 0.32. Originally written by Carl Foust, fixed and compiled for SDK Base 2013 by tuxxi. Adapted from vbsp.exe by Valve Software. (May 25 2016)
8 threads
materialPath: S:\Steam\steamapps\common\team fortress 2\tf\materials
Loading w:\valve hammer editor\10x_redone_stages\powerhouse.vmf
CMaterialSystem::ReloadMaterials bDeviceReady false
 

Phil25

L1: Registered
Jun 13, 2015
49
10
I tried compiling it on a friend's PC and he's got the exact same error. Could it be that a TF2 update messed something up?